Chrono Crusade is a shounen manga series with action, adventure, fantasy, and a dash of sci-fi.

Summary:

It’s the Roaring 20’s in America, right after World War I and before the Second World War. An organization of Demon hunting priests and nuns called the Magdalan Order are busy dealing with Demons trying to come through the borders. Enter Rosette Christopher and her Demon partner, Chrono.Despite being a Demon himself, Chrono is faithful to his partner Rosette and together they hunt Demons who torment the human world. This relationship may be in part due to the contract made between Chrono and Rosette, but it probably is due to the emotional bond these two shares. Things start stirring and it feels like something big is about to happen. How strong is the bond between these two different beings?

Ceres, Celestial Legend, also known by its Japanese name, Ayashi no Ceres is a shojo manga (or shoujo manga) that progresses through normalcy and tragedy, then ending in romance. This series is written and illustrated by Yuu Watase, who also wrote and illustrated Fushigi Yuugi.

Summary:

Aya Mikage lived a normal high school life with her twin brother Aki until the day of their 16th birthday. When attending a family ritual for their birthday, a strange occurrence happens and Aya turns into Ceres, a Celestial Maiden. Ceres has vowed to destroy the Mikage family. The relatives turn on Aya/Ceres to kill her and stop the rampage, but Aya manages to slip away. Confused and conflicted, she determines to find out about Ceres, the Mikages, and how to save her twin brother.